Hi I don't know how this works. I created 6 characters with the same Eye Advanced prefab...brown color eyes. Then for each i saved the character as a prefab. THen i made another character, i use the same Eye Advanced prefab but changed it s texture to blueish eyes. THen holy moly! ALl my saved prefab characters now have blue eyes.HOw do you avoid this?

If you change the color on the same material, then it will change it everywhere that material exists. You can instead break the prefab reference, and then duplicate the material and reassign it to each eye object pair for your individual characters.